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Discussion Starter · #1 ·
Hello all.

I have a friend who has a 1979 datsun 310 with an L4 engine.

He can go out start-up the car, take off, and the car will run like a champ. However, everytime at about 25 minutes into driving the car will begin to run like a whipped pup.

After letting the car cool down, the car will run like a champ again until it hits the 25 minute mark then it is back to running like a whipped pup.

Does anyone have any idea what could be causing this problem?
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